/* ==========================================
   Nelson Lopes - Personal Site v2
   Clean, minimal, security-professional aesthetic
   ========================================== */

:root {
    --color-bg: #fafafa;
    --color-bg-alt: #ffffff;
    --color-text: #1a1a2e;
    --color-text-muted: #64748b;
    --color-accent: #0ea5e9;
    --color-accent-hover: #0284c7;
    --color-border: #e2e8f0;
    --color-card: #ffffff;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --max-width: 720px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    --radius: 8px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --transition: 0.2s ease;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0f172a;
        --color-bg-alt: #1e293b;
        --color-text: #f1f5f9;
        --color-text-muted: #94a3b8;
        --color-border: #334155;
        --color-card: #1e293b;
    }
}

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-accent-hover);
}

img {
    max-width: 100%;
    height: auto;
}

/* Layout */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xl) 0;
}

.section--hero {
    padding-top: 6rem;
    padding-bottom: var(--spacing-xl);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(250, 250, 250, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

@media (prefers-color-scheme: dark) {
    .header {
        background: rgba(15, 23, 42, 0.9);
    }
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.header__logo {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.header__nav {
    display: flex;
    gap: var(--spacing-md);
}

.header__nav a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color var(--transition);
}

.header__nav a:hover {
    color: var(--color-text);
}

/* Hero Section */
.hero {
    text-align: center;
}

.hero__avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin-bottom: var(--spacing-md);
    border: 3px solid var(--color-border);
}

.hero__name {
    font-size: 2.25rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-xs);
}

.hero__title {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.hero__bio {
    max-width: 540px;
    margin: 0 auto var(--spacing-lg);
    color: var(--color-text-muted);
}

/* Social Links */
.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius);
    background: var(--color-card);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    transition: all var(--transition);
}

.social-links a:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
    transform: translateY(-2px);
}

.social-links svg {
    width: 20px;
    height: 20px;
}

/* Credentials */
.credentials {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-xs);
}

.credential {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

/* Sections */
.section__title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.section__divider {
    width: 40px;
    height: 3px;
    background: var(--color-accent);
    margin-bottom: var(--spacing-lg);
    border-radius: 2px;
}

/* Cards */
.card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card__title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.card__description {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* Newsletter CTA */
.newsletter-cta {
    background: linear-gradient(135deg, var(--color-accent), #6366f1);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    text-align: center;
    color: white;
}

.newsletter-cta h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.newsletter-cta p {
    opacity: 0.9;
    margin-bottom: var(--spacing-md);
}

.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    background: white;
    color: var(--color-accent);
    border-radius: var(--radius);
    font-weight: 600;
    transition: all var(--transition);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: var(--color-accent);
}

.btn--primary {
    background: var(--color-accent);
    color: white;
}

.btn--primary:hover {
    background: var(--color-accent-hover);
    color: white;
}

.btn--outline {
    background: transparent;
    border: 2px solid var(--color-border);
    color: var(--color-text);
}

.btn--outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* Contact Form */
.contact-form {
    background: var(--color-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    background: var(--color-bg);
    color: var(--color-text);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.form-submit {
    width: 100%;
    padding: 1rem;
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.form-submit:hover {
    background: var(--color-accent-hover);
}

/* Footer */
.footer {
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.footer a {
    color: var(--color-text-muted);
}

.footer a:hover {
    color: var(--color-accent);
}

.footer__links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

/* About Page */
.about-content {
    font-size: 1.05rem;
}

.about-content p {
    margin-bottom: var(--spacing-md);
}

.about-content h2 {
    font-size: 1.25rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.timeline {
    position: relative;
    padding-left: var(--spacing-lg);
    border-left: 2px solid var(--color-border);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-1 * var(--spacing-lg) - 5px);
    top: 6px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-accent);
}

.timeline-item__date {
    font-size: 0.85rem;
    color: var(--color-accent);
    font-weight: 600;
    font-family: var(--font-mono);
}

.timeline-item__title {
    font-weight: 600;
    margin: var(--spacing-xs) 0;
}

.timeline-item__description {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* Tools Page */
.tools-grid {
    display: grid;
    gap: var(--spacing-md);
}

.tool-card {
    display: flex;
    gap: var(--spacing-md);
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-md);
    transition: all var(--transition);
}

.tool-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.tool-card__icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: var(--color-bg);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
}

.tool-card__content {
    flex: 1;
}

.tool-card__name {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.tool-card__description {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
}

.tool-card__link {
    font-size: 0.85rem;
    font-weight: 500;
}

.affiliate-notice {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

/* Language Switcher */
.lang-switch {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin-left: var(--spacing-sm);
    padding-left: var(--spacing-sm);
    border-left: 1px solid var(--color-border);
}

.lang-switch a {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    border-radius: 4px;
    transition: all var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.lang-switch a:hover {
    color: var(--color-text);
    background: var(--color-bg-alt);
}

.lang-switch a.active {
    color: var(--color-accent);
    background: rgba(14, 165, 233, 0.1);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
        z-index: 101;
    }

    .header__nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--color-bg);
        flex-direction: column;
        padding: 80px var(--spacing-lg) var(--spacing-lg);
        gap: var(--spacing-md);
        transition: right 0.3s ease;
        box-shadow: -4px 0 20px rgba(0,0,0,0.1);
    }

    .header__nav.active {
        right: 0;
    }

    .header__nav a {
        font-size: 1.1rem;
        padding: var(--spacing-xs) 0;
    }

    .lang-switch {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        padding-top: var(--spacing-md);
        margin-top: var(--spacing-sm);
        border-top: 1px solid var(--color-border);
    }

    .section--hero {
        padding-top: 5rem;
    }

    .hero__name {
        font-size: 1.75rem;
    }

    .hero__title {
        font-size: 1rem;
    }

    .credentials {
        gap: 0.375rem;
    }

    .credential {
        font-size: 0.7rem;
        padding: 0.2rem 0.5rem;
    }

    .newsletter-cta {
        padding: var(--spacing-md);
    }

    .tool-card {
        flex-direction: column;
    }

    .footer__links {
        flex-wrap: wrap;
    }
}

/* Overlay for mobile menu */
.nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 99;
}

.nav-overlay.active {
    display: block;
}